What mass of ethanol is formed when 10.9 g of bromoethane is completely hydrolysed (C = 12, H = 1, O = 16, Br = 80)?
Correct answer A. 4.6 g
Explanation
C₂H₅Br + OH⁻ → C₂H₅OH + Br⁻ in a 1 : 1 ratio. Moles of bromoethane = 10.9/109 = 0.10 mol, so 0.10 mol ethanol forms. Mass = 0.10 × 46 = 4.6 g.
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